At Yankee Candle, four large candles and three small candles sell for $34. For two large candles and one small candle, the cost is $16. Choose a system of
equations to find the cost of large and small candles.

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?